1Pandey A. K. , M Biswas and M. M Samman, Damage detection from changes in curcature mode shapes [ J ]. Journal of Sound and Vibration, 1991.
2Kim H. M.,and Bartkowicz T, j.,Damage detection and health monitoring of large space structures[ J], Sound and Vibration, 1993.
3Cawley,P. , and Adams, R. D. , The location of defects in structures from measurements of natural frequencies [ J] . Journal of strain Analysis, 1998.